Meet your spaceship-shaped boat in the Ko'olina Marina in Kapolei. Find a place in one of the several comfortable seating areas, all of which are shaded.
Set out for the reefs, listening to narrative from your marine biologist guide about the behavior of various fish species. You'll be able to see the reef structures, as well as fish and turtles native to Hawaii, many of which aren't found anywhere else. You may even see some dolphins. This allows you to stay comfortable and dry while getting a good look at the underwater world through the magnified glass bottom of the boat; the special glass makes turtles, fish, and coral seem much closer.
Drinks and snacks are available throughout the 1.5-hour excursion and there is a bathroom on board. Return to the marina at the end of your tour; there is a calm lagoon perfect for swimming with children nearby if you'd like to make a day trip out of this excursion.